* kjs/function.cpp: (ActivationImp::ActivationImp): Make a marking
	list, not a refing list.

	- a cut at the sparse array implementation

        * kjs/array_instance.h: Keep storageLength separate from length.
        * kjs/array_object.cpp:
        (ArrayInstanceImp::ArrayInstanceImp): Start with storageLength == length.
        (ArrayInstanceImp::get): Check against storage length.
        (ArrayInstanceImp::put): Ditto.
        (ArrayInstanceImp::hasProperty): Ditto.
        (ArrayInstanceImp::deleteProperty): Ditto.
        (ArrayInstanceImp::setLength): Only enlarge storage length up to a cutoff.
        (ArrayInstanceImp::mark): Use storageLength.
        (ArrayInstanceImp::pushUndefinedObjectsToEnd): Added FIXME.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@2786 268f45cc-cd09-0410-ab3c-d52691b4dbfc